"Yeah.. Hiding in a toilet would be a good idea. I know I'll eventually see someone."
He left his clothes in the room, since he knew there was a public bathroom not too far from his room. Peeking out the door, he saw his sister walking away, and waited for her to leave as a just in case.
Once she was out of sight, he carefully navigated the hallway, making sure to skirt doorways as stealthily as he could before finding the bathroom.
He creaked the door open just to look, and saw his sister's clothes on the floor, with water running at the end. "She must be taking a shower or something."
He crept in so he didn't alert her, and closed the door. Carefully creeping to the toilet, he had to figure out how to get in without making much noise. "This isn't going to be easy"
...Then he realized he could just lift the seat. "Oh yeah..." He lifted it up, stepped into the bowl, and closed the lid over himself, making sure that he's able to get out if needed. "And now we wait."